*Vegging* - Cool vs Warm - Light Question

So I was using 4 cool white fluorescents in my 4ft 4bulb setup. I just swapped 2 of the cool whites and put in some warm ones.

Will this help my vegging? Everyone usually says cool white only I believe. But in the outdated Mr. Green videos he uses 1 warm and 1 white in his T8s. I have a T5 setup.

The whites are 6500k and the warm are 3000k.

Should I revert back to cool only or keep it going with warm and cool?

My plants are little over 3 weeks from seed. I'm using Lucas formula.

Thanks

6500k for veg.

You can still veg with 3000k but your growth won't be as vigorous.

how are the flouros doing? I'm currently building a grow cab in my office with 10 t8 bulbs. I haven't grown with flouro before only cfl and wondering what the yields are like and how well it works. ik its nothing like hps but I got 4 4bulb hoods and one hps 300w I will be using for my flower my clones are only 2 weeks old atm and theyre currently under 2 t8 bulbs.

Hey Mr. Green!
Both the lights you are describing are tri-phosphor lights with mix of red, blue and green phosphors... but mostly green because that is what humans see the best. On the cool whites, there is more blue than red phosphors... still about the same green. On the warm whites, there is more red than blue phosphors... still about the same green. ... about 50 to 60% green.
Plants love green... that is up to about 24%... then they say "NO MORE" and reflect it back to you. This is why your plants look green to humans... they reflect back anything over 24%.

More than anything, your plants want usable photons... this means less green than either of your lamps.
Some people swear that more blue is better for the veggie stage. Research shows that up to 50% blue increases growth... but that study did not consider green. We made VeggieMAX® with 50% blue light for these folk.
Some people swear that more red light is better for the flowering stage based on the McCree curve. Can't find a lick of research that prove this. There is research that shows that at least 10% blue is needed to prevent stem elongation. So we made FlowerPOWER® with 10% blue and mostly red thereafter... for these folk.
Some people swear that full cycle grow lights are better. So we made PowerMAX® with 24% green and a balance of blue and red after that... for these folk.

Over the coming months, we are going to be doing research as to whether VeggieMAX®, FlowerPOWER® or PowerMAX® used single stage, or VeggieMAX®/FlowerPOWER® used dual stage produce more weed per watt. Until that time, it is only an opinion as to whether warm vs cool is better.

Ron
WeedBulbs.com

superbak3d said:

6500k for veg.

You can still veg with 3000k but your growth won't be as vigorous.

Click to expand...

Are you sure about this? I know you need 6500k for veg but I thought mixing the spectrum produces more healthier plants in veg? Was this in flower? Also ..what was the "real mr green" talking about then in his famous video?

6500k still contains a bit of green spectrum.

I mixed 2700k in with the 6500's. Watch em for a week. You've committed no error in mixing the spectrum and won't set them back.

Most who get good success with fluoros in my experience use a combination of the 2 spectrums. In veg usually 2:1 or 3:1. The larger number for veg. In flower they reverse this and still keep 1 6500K and 3 2200-3000K bulbs in a 4-bulb fixture. The use of a majority of the lower end in veg causes some node spacing stretch.

hotrodharley said:

Most who get good success with fluoros in my experience use a combination of the 2 spectrums. In veg usually 2:1 or 3:1. The larger number for veg. In flower they reverse this and still keep 1 6500K and 3 2200-3000K bulbs in a 4-bulb fixture. The use of a majority of the lower end in veg causes some node spacing stretch.

Click to expand...

So right now I have a 1:1 ratio. So it sounds like just make it a 3:1. hmmmm

Right now I have it as COOL WARM COOL WARM...in the 4 bulb fixture

I'm setting up as w,w,c,w,w,c,w,w,

Having a mixed or full spectrum is the best way to go no matter what lighting your are using. When i used only t5 i always had a mix of cllo and warm bulds. More cools in veg and more warms in flower.